Dre appeared for “Still D.R.E.” and stuck around to join Em for Dre and Snoop Dogg’s “Nothin’ but a G Thang,” 2Pac’s “California Love,” and “Forgot About Dre.” 50 Cent played a medley including “In Da Club” and “My Life,” while Skylar Grey filled in for Dido on “Stan,” Beyoncé on “Walk on Water,” and Rihanna on “Love The Way You Lie.” Bebe Rexha made a cameo for “The Monster.” Eminem followed Saturday night headliner Beyoncé.